Pregnancy test questions

hi everyone,

I started developing some minor symptoms of pregnancy last night (7DPO) like nausea & slight cramping but over the last week feeling really moody & tired. I did decide to take a pregnancy test and please see them below. I took the line one first and you can see a faint line, so I took a digital one afterwards. The digital one said pregnant. My husband and I had a miscarriage in November and we have been trying, so needless to say I’m very anxious. When i took another one to confirm the digital one it said not pregnant… so this morning 8DPO I took another line test and it looked the same as the line test i took yesterday. Please be kind in your comments. Has anyone experienced this before?